Re: [Gphoto-user] Re: [gphoto-devel] Canon A60 and A70 in "canon mode"

[Stephen H. W. <we...@gr...>]

> From: Tobias Klausmann <kla...@sc...>
> Date: Mon, 21 Jul 2003 19:43:31 +0200
> 
> Hi! 
> 
> On Mon, 21 Jul 2003, Stephen H. Westin wrote:
> > > 0.183359 gphoto2-port(0): Could not find USB device (vendor 0x4a9, product 0x3073). Make sure this device is connected to the computer.
> > 
> > This is your camera. It wasn't found. Does it really work to list files?
> 
> Yes, otherwise I wouldn't know how the first 1200+ pictures I've
> archived found their way onto my computer :)
> 
> > > 0.364914 gphoto2-setting(2): Setting key 'port' to value 'usb:' (gphoto2)
> > > 0.364944 gphoto2-setting(2): Saving 8 setting(s) to file "/home/klausman/.gphoto/settings"
> > > 0.365205 gphoto2-camera(2): Initializing camera...
> > > 0.365267 gphoto2-port(0): Could not find USB device (vendor 0x4a9, product 0x3073). Make sure this device is connected to the computer.
> > > 0.365326 context(0): An error occurred in the io-library ('Bad parameters'): Could not find USB device (vendor 0x4a9, product 0x3073). Make sure this device is connected to the computer.
> > 
> > See? We didn't establish contact with the camera. This isn't a
> > "capture image" problem. Can we see --debug output from a successful
> > camera operation? And the output from "cat /proc/bus/usb/devices".
> 
> I've done a few logfiles and experimentation. As it seems, the
> camera won't be discovered at all when in "rec mode" and just
> crash when asked to capture in "play mode".
> 
> The corresponding logfiles and /proc/bus/usb/devices dumps can be
> found here:
>      http://eric.schwarzvogel.de/~klausman/gp2/
> 
>  capture_play_mode.log  trying --capture-image with the cam set to play *
>  capture_rec_mode.log   same, rec mode **

OK, this one is useful.

>  list_play_mode.log     trying --list-files in play mode
>  list_rec_mode.log      same, rec mode 

This seems to have worked correctly.

> * camera crashes on first attempt
> 
> ** camera can be used (dump files, delete files, delete all)
> normally but the buttons on the camera have no effect until
> camera ist switched off, taken off the bus and let alone for
> about 10s, then switched on.

That's normal; for the PowerShot cameras, the assumption is that you
unplug from USB when you want to use the on-camera controls again.

>  usb-devices_play_mode.txt  after powercycling camera, attach to
>  usb-devices_rec_mode.txt   usb bus and set to play/rec.
> 
> As it seems, the camera is only visible via USB when in play
> mode.

I agree. And it's normal to set the camera to "play" mode for USB
control, even when you want to capture images.

> > Come to think of it, is the camera working in PTP mode? A --debug log
> > would tell us.
> 
> As far as I can tell, gphoto uses the cam native mode
> automatically.

That's correct, as I can see from your logs.

> In PTP mode there is no "capture" capability, if I
> parse --abilities correctly.

A limitation of the PTP2 driver, I think; I suspect the hardware can
do it, but it would require reverse-engineering of just how Canon
handles this in PTP mode.

There is definitely a problem: the camera doesn't respond correctly to
the "start remote capture mode" command. Here is the interesting bit
of your log:

  3.575281 canon/usb.c(2): canon_usb_dialogue() cmd 0x13 0x12 0x201 (Remote camera control)
  3.575303 canon/usb.c(2): canon_usb_dialogue() called with CONTROL_CAMERA, Camera control init
  3.575324 canon/usb.c(2): Payload :
  3.575345 canon(3): Hexdump of 8 = 0x8 bytes follows:
  0000  00 00 00 00 00 00 00 00-                         ........        
  
  3.575368 gphoto2-port(2): Writing message (request=0x4 value=0x10 index=0x0 size=88=0x58)...
  3.575391 gphoto2-port(3): Hexdump of 88 = 0x58 bytes follows:
  0000  18 00 00 00 01 02 00 00-00 00 00 00 00 00 00 00  ................
  0010  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
  0020  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
  0030  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
  0040  02 00 00 00 13 00 00 12-18 00 00 00 05 00 00 00  ................
  0050  00 00 00 00 00 00 00 00-                         ........
  
  3.578074 gphoto2-port(2): Reading 64=0x40 bytes from port...
  18.581636 canon/usb.c(2): canon_usb_dialogue: read 1 of 64 bytes failed! (Error reading from the port)
  18.581678 canon/canon.c(2): Camera control init returned msg=(nil), datalen=0
  18.581715 context(0): Error capturing image
  
  *** Error ***

Any chance of a USB stream dump from the Windows software? I use
SniffUSB, and I can parse that output.

-Stephen H. Westin
Any information or opinions in this message are mine: they do not
represent the position of Cornell University or any of its sponsors.